Deserializing objects sent from a client program to a server program

Processing Libraries
8 
/**
 * Serializable PImage (v1.0.1)
 * GoToLoop (2019/Dec/26)
 *
 * https://Discourse.Processing.org/t/
 * deserializing-objects-sent-from-a-client-program-to-a-server-program/16124/8
 */

import java.io.Serializable;

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectOutput;

import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.io.ObjectInput;

static final String FILENAME = "imagen.serial", URL =
  "https://" + "Forum.Processing.org/" + "processing-org.jpg";

PImage img;

void settings() {
  img = loadImage(URL);
  size(img.width, img.height);
  noLoop();
}

void setup() {
  saveSerial(FILENAME, new SerializableImage(img));
  img = ((SerializableImage) loadSerial(FILENAME)).createImage(this);
}

void draw() {
  background(img);
}

void saveSerial(final String filename, final Object o) {
  final File f = dataFile(filename);
  createPath(f);

  try {
    final ObjectOutput out = new ObjectOutputStream(new FileOutputStream(f));
    out.writeObject(o);
    out.close();
  }

  catch (final IOException e) {
    e.printStackTrace();
  }
}

Object loadSerial(final String filename) {
  final File f = dataFile(filename);

  try {
    final ObjectInput in = new ObjectInputStream(new FileInputStream(f));
    final Object o = in.readObject();
    in.close();
    return o;
  }

  catch (final IOException e) {
    e.printStackTrace();
  }

  catch (final ClassNotFoundException e) {
    e.printStackTrace();
  }

  return null;
}

static public class SerializableImage implements Serializable {
  static protected final long serialVersionUID = 123;

  public int w, h, type, scale, pix[];

  public SerializableImage(final PImage img) {
    w = img.width;
    h = img.height;
    type = img.format;
    scale = img.pixelDensity;
    img.loadPixels();
    pix = img.pixels.clone();
  }

  PImage createImage(final PApplet p) {
    final PImage img = new PImage(w, h, type, scale);
    img.parent = p;
    img.loadPixels();
    arrayCopy(pix, img.pixels);
    img.updatePixels();
    return img;
  }
}